There is another angle here besides copyright and that is the sharing of prop/trade secret data. This model is only available to specific orgs who request it (i.e. it's non-public) and I imagine that there are confidentiality terms for the orgs that get the access.
Not too familiar with the drama but I believe what happened was that someone with access leaked the torrent used to download the weights. In a legal sense this would be similar to someone say leaking a Google Drive link containing prop information that was only intended to be shared with vendors.